Improvement in regenerative hot-blast ovens



2 Sheets-Sheet 1. J. M. HARTMAN. Regenerative Hot-Blast Oven. No. 214,294. Patented April 15, 1879.

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.2 Sheets-Sheet 2.

.J. M. HARTMAN.

Patented April 15, 1879.

UNITED STATES PATENT OFFIE.

JOHN M. HARTMAN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN REGENERATIVE HOT-BLAST OVENS.

Specification forming part of Letters Patent No. 214.294, dated April 15, 1879; application led May 14, 1878.

To all whom t may concern:

Be it known that I, JOHN M. HARTMAN, of Philadelphia, Pennsylvania, have invented a new and useful Improvement in Regenerative Hot-Blast Stoves for Iron-Smelting Furnaces, which improvement is fully set forth in the following specication and accompanying drawlugs.

The invention relates more particularly to a brick used in the construction of the interiors of said stoves, each of said bricks being an oblong block centrally recessed and provided with a projecting lug, which bricks, when in place, are laid in contiguous layers and litted to each other. By this construction gas and i'lame are prevented from passing through the brick work, the displacement of the brick- Work by sudden explosions obviated, and the expansion of the same under the action of heat allowed.

Figure lis a horizontal section through a hot-blast stove. Fig. 2 is a vertical section through the same. Fig. 3 is an enlarged horizontal section, showing the shape of the brickwork. Figs. 4 and 5 show the bricks in detail.

In the drawings, A represents the combustion-chamber, surrounded by a circular wall, C. B is the cellular brick-Work forming the regenerative portion of the stove. D is the Wroughtiron shell; e, projecting lire-bricks to preserve an air-space next to the shell. G is the gas inlet; g1, outlet for hot air; g2, dust-opening; g3, outlet to chimney.

In the use of rebrick stoves frequent explosions occur, by which the brick-Work of the vertical Walls B is displaced or thrown down. I overcome this by interlocking the brick-Work by means of projections upon the end or edge of the brick, which fit into corresponding recesses in the next contiguous brick.

Figs. 4 and 5 show, respectively, the edge and side of a brick, having a projecting lug, lo, at one end, and a recess, k2, in its side, into which tits the lug of another brick corresponding to lug k. By this plan the vertical walls of a regenerative hot-blast stove retain their posit-ion better and are much more edicient as heating-surfaces than as at present constructed.

The construction of the bricks employed also admits Of the expansion of the walls under the action of heat.

I claim-` In a regenerative hot-blast stove, the brick B, consisting of a block having the recess k2 and projecting lug k, as specified.

JOHN M. HART MAN.

Vitnesses:

EDWD. BROWN, JOHN F. GRANT. 

